hamas shot rockets for the first time as paniced residents ran for cover. isreal has sent troops and weapons toward gaza and have called up tens of thousands of reserve vist. this comes after the hamas was killed in an air strike. >>> it's become a pretty popular alternative to coffee. >> but now the f.d.a. is looking at whether an energy shot could have played roles in 13 deaths. >> well the people who died had one thing in common. they had all used five hour energy. the reports included things like heart attacks, convulsions and even a spontaneous abortion. it's not what role if any the product played in the deaths. and children under 18 shouldn't use it at all. >> wherever they are sold, they fly off the shelf. >> people like this one especially. >> but what is good for business might not be good for your health t. size of this product five hour energy can be deceiving. >> people assume it's not that much so they might take a second one which gives them a huge jolt of caffeine. >> now the f.d.a. is investigating whether the shots have led to death which